Despite their excellent, useful, and stable properties, thermoplastics are constantly subject to environmental risks because of their low degradability under thermal, chemical, and mechanical stresses. To overcome the aforementioned issues, we hereby introduce an eco-friendly camphor (Ct) cyclic diester. The Ct diester is designed as a monomer, including a ketal group from the Ct, and shows high thermal stability via a rigid spiro-ring and a bridged bicyclic structure. A series of polyester was synthesized using the Ct diester, including various types of diols and dimethyl terephthalate. PETxCty copolyesters showed appropriate thermal stability up to 414 °C and a high glass transition temperature. This thermal behavior led to amorphous regions as the Ct diester content increased. Regarding the proportion of the Ct diester in the polyester, it was sensitive to hydrolysis and contributed to the degradation of the polyester in acid buffer conditions. Graphical Abstract

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As a key structural element, polyimides (PIs) are garnering attention as high-functional polymers in the microelectronics and optical elds. Recently, their structural behaviour renders PIs as promising candidates for the formation of charge-transfer complex (CTC). However, unfortunate drawbacks of PIbased CTCs are in their insolubility and low degradability. The endeavour to overcome the aforementioned issue is aimed at designing biodegradable PIs with high solubility. A novel organic diamine monomer bridges this gap. Based on these fundamental phenomena, we demonstrate an environmentally-friendly camphor aromatic diamine (CAD diamine). The efforts described herein shows excellent solubility and thermal stability by introducing two spiro moieties. Ultrafast degradable PIs were further prepared from CAD diamine, which not only prevented the polymer deterioration but also reported ultrafast degradability in a su cient manner.

As a key structural element, polyimides (PIs) are garnering attention as high-functional polymers in the microelectronics and optical fields. Recently, their structural behaviour renders PIs as promising candidates for the formation of charge-transfer complex (CTC). However, unfortunate drawbacks of PI-based CTCs are in their insolubility and low degradability. The endeavour to overcome the aforementioned issue is aimed at designing biodegradable PIs with high solubility. A novel organic diamine monomer bridges this gap. Based on these fundamental phenomena, we demonstrate an environmentally-friendly camphor aromatic diamine (CAD diamine). The efforts described herein shows excellent solubility and thermal stability by introducing two spiro moieties. Ultrafast degradable PIs were further prepared from CAD diamine, which not only prevented the polymer deterioration but also reported ultrafast degradability in a sufficient manner.